deejayx757

iTrader: (2)

yesterday i was driving and it was wet out so i decided to get the rpms up to 7500 and when i let off the gas the car backfired like crazy , all the way down to idle then sounded like it was running super rich or on 1 rotor or something and i could barely even move anywhere , i thought it was a stuck open injector because the guy i got the car from gave me new injectors when i got the car and said it flooded out sometimes ? Also When My car messed up i could turn the car on without the fuel pump connected and it would run , but like **** ofcourse and it wouldnt die out unless i gas'd it.. regardless i turned the key to the on position and looked under the hood and sounded like an injector vibrating or whatever so i pulled my manifold off and replaced the lower injectors , turned the car to the on position to see if they leaked after i installed them (yes i am a first timer) and they didnt seem to leak , i Put everything back together and its doing the same thing is was doing before i changed the TWO Lower Injectors . Mind you these injectors are from Rock Auto brand new for like 130$ a piece (Via Injector Part Number). Made sure to lube the o rings too , i just dont see what it could be ? Going to Pull the codes later on today and try and figure this out , This car is my daily and i really need it on the road asap :[

lduley

iTrader: (1)

the symptoms your describing sound like a tired motor, and running with the fuel pump unhooked can happen, cause theres still pressure in the lines. I would definitely do do a compression check. or you may even have bad new injectors, usually doesn't happen, but can

RotaryEvolution

iTrader: (30)

compression test.

Molotovman

iTrader: (49)

This happened to me once at a drift event with my S5 N/A. I blew most of the vacuum hoses off of their nipples.
Check them, if they're on, do a compression test.

RotaryEvolution

iTrader: (30)

they must have been extremely loose since the n/a can barely manage 1-2psi of resonant pressure.

Molotovman

iTrader: (49)

I don't think they were. I think the throttle transitions just caused some A/F mixture to surge back into the intake and it ignited.
A lot of WOT and heavy load that day.
It was great!

deejayx757

iTrader: (2)

so i tried to check my codes and ended up killing the cel light somehow ? maybe i killed the ecu .. going to get a new ecu and do a compression check soon ..

satch

iTrader: (1)

Could be just the light bulb. You could also use the code checker light used for the S4 and use it on an S5. Cost about a few bucks to make. The check connector near the lead coil w/four wires is where you plug in the code checker light.

satch

iTrader: (1)

http://2ndgenrx7.freeservers.com/error%20codes.html

Lavitzlegend

iTrader: (3)

Have you checked to see if the TPS is stuck in? I had this happen once and the injectors were pumping fuel in like crazy without any throttle input so it ran like complete crap. I swapped the TPS out with one that actually functioned properly and the car ran fine after. Something to consider before dropping money on other things.

deejayx757

iTrader: (2)

turns out the vaccum for the tps was clogged .. all back to normal ! :]

clokker

iTrader: (2)

"Normally" there is no vacuum to the TPS.

deejayx757

iTrader: (2)

any guess on why my car still hesitates to go past 6500 under load but just WOT at idle i can redline .. any suggestion would really be helpful as you can see i need a rotaries for dummies book .

satch

iTrader: (1)

Are you redlining while in neutral or in gear?

deejayx757

iTrader: (2)

Redlined in gear and in neutral , I believe that wouldn't really make a difference any ways regardless in gear or neutral the car isn't under any load .


Is there anyway to lower Idle , my car is stock s5 6 port na and idles at 1.8 -2k rpms

satch

iTrader: (1)

If you're redlining while driving then it is under load. Redline while in neutral and you're not under load. Check the throttle cable for being too tight for starters.

deejayx757

iTrader: (2)

ok so it took 3 seconds and a brain to lower my idle by adjusting the throttle cable nut , now i realized i lost the clip to hold the throttle cable tight when i put my intake manifold back on from swapping out injectors .. i got it idle'n at 800 now but still leans out or gets too rich at 6500 rpm helpppp